Go Back   Home > Forums > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Class D Switching Power Amplifiers and Power D/A conversion

Hypex NC502MP - how to use front power switch AND 12V trigger
Hypex NC502MP - how to use front power switch AND 12V trigger
Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 23rd May 2018, 03:22 AM   #1
KEtheredge87 is offline KEtheredge87
diyAudio Member
 
Join Date: May 2018
Default Hypex NC502MP - how to use front power switch AND 12V trigger

Hi Everyone,

Hoping to poll the wisdom of the group here, as I'm a mechanical engineer who can't help but tinker with electronics. I have recently come into possession of a Hypex NC502MP amplifier board, and I have a question about power standby switches and 12V trigger inputs from AV receivers.

I have read the datasheet on the hypex amp a few times, and it seems I can use the low power SMPS with a 12V trigger to turn the main SMPS and amplifer section ON when I feed a 12V DC signal to the proper pin. At the same time, I would like to include a standby power button on the front my amplifier case in the event I need to unplug the speakers, and I can't reach the rear of the amplifier chassis. That said... I can't quite think my way through a switching or relay setup that would allow the 12V trigger to work, and the front power switch to interrupt it.

Ideally when I press the front power switch, the main SMPS power would turn off, yet this state would not be remembered by the amp. In my head this equates to a reset condition, where turning off my AV receiver (removing the 12V DC trigger voltage) would reset the standby switch. This way I won't have to walk over to the amplifier and hit the front switch every time I forget, and wonder why the 12V DC trigger didn't work.

I hope I've made some sense here, and that someone's got a relatively simple solution to show me. Remember... I'm a mechanical guy, so assume I barely know the difference between a light switch and a...well crap, I can't even form a good metaphor there!

Thanks in advance for any help!
  Reply With Quote
Old 29th September 2018, 07:53 AM   #2
madtecchy is offline madtecchy  England
diyAudio Member
 
Join Date: Dec 2010
Location: wigan
So you want a switch on the front panel that isolates the remote 12v trigger signal so you can safely connect and disconnect speakers , Is the 12v remote trigger in another room or in the same location as the amplifier ????
  Reply With Quote
Old 29th September 2018, 10:07 AM   #3
russc is offline russc  England
diyAudio Member
 
Join Date: Mar 2011
Location: W Yorkshire
The PS Enable pin must be "high" for power on. 3.3 to 12v.
This can be sourced from the Standby-SMPS.
A simple latching on-off switch can do this.
If you want to switch from an external source (eg a pre-amp which outputs a trigger then the safest way is to use a transistor in place of the above switch, your external source switches the transistor, thus you are not exposing the amplifier directly to external signals.
  Reply With Quote
Old 29th September 2018, 10:15 AM   #4
russc is offline russc  England
diyAudio Member
 
Join Date: Mar 2011
Location: W Yorkshire
Anaview AMS0100-2300 build
A suitable circuit for external trigger, high to enable, low to disable.
  Reply With Quote
Old 29th September 2018, 01:52 PM   #5
KEtheredge87 is offline KEtheredge87
diyAudio Member
 
Join Date: May 2018
Hi Madtecchy and RussC, Thanks for the replies. My goals here are to use the Hypex amp with a standard AV receiver. If I can properly include a 12VDC trigger function on the Hypex amp, then I can get the Hypex to power up when I turn on the AV receiver. I'm just trying to avoid the requirement of physically touching the Hypex unit to turn it on and off, unless I am plugging in speakers.

So, as you guys have mentioned, I would like a latching switch on the front of my chassis that will control the PS enable signal that is sourced from the standby SMPS. Ideally, I would leave this switch latched in the ON position, so that the AV recevier controls the Hypex amp by sending the 12VDC trigger signal.

I have some Crown XLS1502 amplifiers that can use this kind of "sleep mode" using a 12V contact closure, but that requires a relay rather than a simple 12VDC signal. I'm just trying to bake a similar function into the Hypex.

Does that still require a transistor to accomplish?

Thanks!
  Reply With Quote

Reply


Hypex NC502MP - how to use front power switch AND 12V triggerHide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Hypex Ucd700 or NC502MP? ghitus Class D 1 16th January 2018 02:39 PM
Rotary front panel power switch for 4U chassis bjorgens Pass Labs 5 8th April 2014 03:47 AM
Push button power On/Off switch for a 10 mm front panel NicMac Parts 7 22nd February 2010 09:24 PM
Adding a 12V power trigger switch to Electrocompaniet Power Amp maxzimum Solid State 0 11th April 2008 02:54 PM


New To Site? Need Help?

All times are GMT. The time now is 04:01 AM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.00%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Copyright ©1999-2018 diyAudio
Wiki